3 Answers

listen for or inspect the actuator door to open when you hit the button or , , access the two hoses of the heater core at the firewall under the hood , see if you can get a hose on one to see if it flows through fully , to see if it's clogged , which ever is easier

My 2000 blazer with 4.3 vortec has a bad hitch to it when its cold, but when the truck
warms up it runs like a top, It almost acts like its losing fire but its has great fire, I have
been told its m...

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